Both Mayweather and McGregor were present for the first stop of the world tour with McGregor taking to the mic first. "The Notorious" fired off his shots at Mayweather during his opening speech.

Mayweather then took to the mic and fired off his own verbal shots at McGregor.

"I ain't back down from no motherf*cking body. You line em up and I knock em down like bowling pins. On August 26, I'mma knock this b*tch out too."

Mayweather went on to talk about his financial success as a fighter over his opponent.

"He look good for a seven-figure fighter," Mayweather said. "He look good for an eight-figure fighter but motherf*cker I'm a nine-figure fighter. And y'all know what? This b*tch made $3 million his last fight! Well, we know that's training camp money for me."

Mayweather went on to bring up his own age and Conor's last loss to Nate Diaz, which happened in 2016.

"And guess what, I'm a old man," Mayweather said. "I'm a old man. I'm not even the same man I was 20 years ago. I'm not the same fighter I was 10 years ago. I'm not the same fighter I was five years ago. I'm not the same fighter I was two years ago. But, I got enough to beat you. And, we know Mr. tapout like to quit and you will wave that white flag. And I'm guaranteeing you this. You're going out on your face or you're going out on your back. Now which way you want to go?"

Even after the shots thrown back and forth between the two, "Money" still took the time to thank everyone involved including the MGM Grand, Showtime, MMA fans, Dana White and even Conor McGregor and his team.

"It takes two warriors to bring an event like this together," said Mayweather. "And, the two biggest names in combat sports did this. So, I didn't do this by myself. This man played a major part in this fight but on August 26, that's your ass. That's your ass."

Floyd Mayweather has come out of retirement at 40-years-old to fight Conor McGregor and holds a perfect 49-0 professional boxing record. "Money" last fought Andre Berto to a unanimous decision win back in 2015.

Conor McGregor holds a 21-3 professional mixed martial arts record and will be making his professional boxing debut with against Mayweather, who many consider the greatest boxer of this generation. "The Notorious" last fought in November at UFC 205 where he beat Eddie Alvarez to become the UFC lightweight champion and made history by becoming the first fighter to hold two UFC division titles simultaneously.

How do you think the fight between Floyd Mayweather and Conor McGregor will go on August 26? Let's get to this discussion in the comment section!